Well, I know one way to fix the problem, and am trying to find a faster one.
If I systematically go through the sequence and into nested sequences (sometimes a few levels deep), I can set the panning to be what it should be. But I can’t just change it at the top level because anything that’s nested will still pass along its incorrectly configured audio.
Even just exporting one track at a time at the top level won’t help because the nested sequences that comprise it are wrong. If there’s no way else to solve it, I can at least do it this way. Thankfully this approach won’t require doing each individual clip, and there are thousands, that comprise the final sequence.
That being said, TFA has very few nested sequences, being fairly straightforward and done over a short period of time, and will be handled first. I’ll finish the TFA project as planned before going back and fixing the prequels for one… last… reissue.